B-52: POTENTIAL FOR ACCIDENTS WITH THIS PLANE?

There's a youtube video of a B-52 doing practice maneuvers for an airshow. The B-52 makes a U-turn, comes around, and after the U-Turn the plane never comes out of its left bank. The left wing is still banked down, and the plane plows into the ground, and becomes a huge fireball. Question: Is there some engineering design flaw of the B-52 whereby a large angle turn bank is difficult to come out of? maybe its pilot error? OR maybe B-52s should simply not be part of low-altitude airshow exercises!!